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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2006-03-31 23:32:07 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2006-03-31 23:32:07 +0000 |
| commit | a8b8f4db23cff16af50a2b960cb8d20d39b761cf (patch) | |
| tree | 224f8cb0da7e2e17ccfd7b8a030db1664acd46c1 /src/include/access/hash.h | |
| parent | 89395bfa6f2fafccec10be377fcf759030910654 (diff) | |
| download | postgresql-a8b8f4db23cff16af50a2b960cb8d20d39b761cf.tar.gz | |
Clean up WAL/buffer interactions as per my recent proposal. Get rid of the
misleadingly-named WriteBuffer routine, and instead require routines that
change buffer pages to call MarkBufferDirty (which does exactly what it says).
We also require that they do so before calling XLogInsert; this takes care of
the synchronization requirement documented in SyncOneBuffer. Note that
because bufmgr takes the buffer content lock (in shared mode) while writing
out any buffer, it doesn't matter whether MarkBufferDirty is executed before
the buffer content change is complete, so long as the content change is
completed before releasing exclusive lock on the buffer. So it's OK to set
the dirtybit before we fill in the LSN.
This eliminates the former kluge of needing to set the dirtybit in LockBuffer.
Aside from making the code more transparent, we can also add some new
debugging assertions, in particular that the caller of MarkBufferDirty must
hold the buffer content lock, not merely a pin.
Diffstat (limited to 'src/include/access/hash.h')
| -rw-r--r-- | src/include/access/hash.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/src/include/access/hash.h b/src/include/access/hash.h index 0d34b29cfa..6f22d50da7 100644 --- a/src/include/access/hash.h +++ b/src/include/access/hash.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.67 2006/03/24 04:32:13 tgl Exp $ + * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.68 2006/03/31 23:32:06 tgl Exp $ * * NOTES * modeled after Margo Seltzer's hash implementation for unix. @@ -278,7 +278,6 @@ extern Buffer _hash_getbuf(Relation rel, BlockNumber blkno, int access); extern void _hash_relbuf(Relation rel, Buffer buf); extern void _hash_dropbuf(Relation rel, Buffer buf); extern void _hash_wrtbuf(Relation rel, Buffer buf); -extern void _hash_wrtnorelbuf(Relation rel, Buffer buf); extern void _hash_chgbufaccess(Relation rel, Buffer buf, int from_access, int to_access); extern void _hash_metapinit(Relation rel); |